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The Correct Way to Enable AC3 Passthrough with Quicktime
https://www.cod3r.com/2008/02/the-correct-way-to-enable-ac3-passthrough-with-quicktime/
Passthrough is still a hack, and thus this hack is still outside of the specs. Note 2: Apple broke AC3 rather seriously in QT 7.3 (bug id 5594478, go tell them to fix it). If have a .mov file, open it, and it says that it is stereo audio rather than 5.1, this is a symptom of that bug.
How to Play 5.1 Dolby Digital Audio in QuickTime Mac OS …
https://www.instructables.com/How-To-Enable-Dolby-Digital-AC3-Passthrough-In-Mac/
1: Insert your Toslink cable into the headphone output on your computer. This may require a Mini Toslink to Toslink adaptor (if you have a Mac Pro or Power Mac G5, then insert it into the Toslink output). 2: Open Audio MIDI Setup, located in the utilities folder, in the applications folder. 3: Under audio output, set the format to 48kHz (48000Hz) and 2ch-24bit (don't select encoded …
Audio passthrough line noise, in Audition, but not Quicktime.
https://community.adobe.com/t5/audition/audio-passthrough-line-noise-in-audition-but-not-quicktime/td-p/10962859
I'm trying to record audio via a USB interface (Behringer UCA200) connected to my mixing desk (Behringer XENYX1204FX) via phono. If I record in QuickTime the audio is clean and crisp, but when I use Audition with the same setup I get a lot of line noise/interference. Sample of Audition recording...
Surround Sound in QuickTime? - Apple Community
https://discussions.apple.com/thread/1706701
Unfortunately, the readme for QuickTime has said that since about version 7.0 — I was referring to efforts to provide audio passthrough to surround receivers via the optical output built into Macs and MacBook Pros.
About the QuickTime Movie Encoder Pane
https://help.apple.com/compressor/mac/4.0/en/compressor/usermanual/chapter_21_section_2.html
If you require audio passthrough for a Final Cut Pro sequence, export a QuickTime movie (File > Export > QuickTime Movie) and then import the movie into Compressor. Important: If a setting has “Pass-through” selected, the Filter pane audio filters are not available.
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